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Viscosity in different subdomains

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5 years 6 months ago #1194 by noname
Viscosity in different subdomains was created by noname
Hello everyone,

I have divided my domain into 2 sub-domains sucsessfully following the documentation.
With single domain I used to set a single value to a viscosity but now I want to define different viscosities in
different subdomains, anyone knows how to set this ?

Thanks in advance.
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5 years 6 months ago #1195 by cwinters
Replied by cwinters on topic Viscosity in different subdomains
Hi,

you can use domain-wise coefficient functions by using as list of values/functions as argument of the CoefficientFunction.
Code:
from netgen.geom2d import SplineGeometry geo = SplineGeometry() geo.AddRectangle((0,0),(1,1),leftdomain=1,rightdomain=0) geo.AddRectangle((0.3,0.3),(0.7,0.7),leftdomain=2,rightdomain=1) from ngsolve import * mesh = Mesh(geo.GenerateMesh(maxh=0.2)) Draw(mesh) Draw(CoefficientFunction([1,2]),mesh,'cf')

I hope that's what you are looking for.

Best,
Christoph
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